From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 546B937649B; Wed, 2 Sep 2026 02:44:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788317099; cv=none; b=s9+fNqlR9YDcTaj7ubX6Hr5xE0sC05JxtKA0QR3lezbqZFCDUX9A3QL4quTN+pD43VCjEe8ZIeBE0F65V9Fk8ksioBBaRtabO4afbgmGKJ41pbPe3ZMd40EDJ1NeukpGGqn3NLJXk9T7wjxAkoxpG8UpiN44bkWzyL5bAIETkXc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788317099; c=relaxed/simple; bh=Wox4+reExSM56rTC9T/fXMNHX2BRtpavL8TPsWVeVuI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PisTEqphgQr6IJTQo3PILIpe6SA3FE+NX0PsD4qUN20svxO1C+sBp91xuDxp0f1cEN83xnLT+zt4sqNXOrmyKLa4Dfk7J9H22sd02dOmuHYnfgaq4Tm0U1PhdZu27VYXx0vsG9o96eWGJ/OzW2hhb+OVgVTgyRIK3Ycl/4EZjR0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Pd5c7ogF; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Pd5c7ogF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1788317098; x=1819853098; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Wox4+reExSM56rTC9T/fXMNHX2BRtpavL8TPsWVeVuI=; b=Pd5c7ogFRt3UPeKN1nyAHq5HHzm04o94cwnFt2oTgmEa6TrirK555LA8 Vfv9YXhgdX/2MCdgznYvSGZJgtdoNAmRVD9zil93aTCdYaCbtwtuybb/5 QWB28CyqV6fARloM11R3z8KP7JUT/yuKPWvnNPidAKuHUgmk4dEYLW4DS UlmAyDSvWnLMIlqb7e79FSXkuM1PAsAlNujfdS2T0a+djd1JnIwMq9DQB 1rSbsenwthJD5crsTKHquUV+DIIXtPvmHONqJ91gaeeiK0a1xcJIplObJ kfh90eIUAinvNzPAbs5bdeMEgMBbeF5wnd0Hk2oHOjXab5EWXiEXDWBFe w==; X-CSE-ConnectionGUID: wIfPmnTOSgeJnBJy/i7WDQ== X-CSE-MsgGUID: oI17xsBJRwuCLdaGP9sDbA== X-IronPort-AV: E=McAfee;i="6800,10657,11893"; a="106282955" X-IronPort-AV: E=Sophos;i="6.25,257,1779174000"; d="scan'208";a="106282955" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2026 19:44:58 -0700 X-CSE-ConnectionGUID: rzrA/elaQaeABjnGxyW3pg== X-CSE-MsgGUID: kZRFquGESO2ieQ5Qn+pxtA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,257,1779174000"; d="scan'208";a="272775527" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.174]) by orviesa003.jf.intel.com with ESMTP; 01 Sep 2026 19:44:58 -0700 From: "Chang S. Bae" To: pbonzini@redhat.com, seanjc@google.com Cc: kvm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com Subject: [PATCH v7 13/20] KVM: x86: Reject EVEX-prefixed instructions Date: Wed, 2 Sep 2026 02:17:57 +0000 Message-ID: <20260902021804.718676-14-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260902021804.718676-1-chang.seok.bae@intel.com> References: <20260902021804.718676-1-chang.seok.bae@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Explicitly mark EVEX-prefixed opcodes (0x62) as unsupported. Signed-off-by: Chang S. Bae --- arch/x86/kvm/emulate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index eba4e9b7cd5c..f0d5a40eba27 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -5052,6 +5052,11 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len, int if (opcode.flags & ModRM) ctxt->modrm = insn_fetch(u8, ctxt); + /* EVEX-prefixed instructions are not implemented */ + if (ctxt->opcode_len == 1 && ctxt->b == 0x62 && + (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0)) + opcode.flags = NotImpl; + done_modrm: ctxt->d = opcode.flags; while (ctxt->d & GroupMask) { -- 2.53.0